NORTH AMERICAN CERCOSPOR^. 



Hyphie hypophyllous, fasciculate, short (40— 60 /^-), torulose, sparingly 

 septate, brown, forming indeterminate, dark brown patches or spreading 

 over the greater part of the leaf. Conidia attenuate clavate, 80 — 120 x 5 

 — 7 y , multiseptate and often constricted at the septa, brownish. 



On living leaves of Gleditschia triacanthos, Carolina (Ravenel), Illinois 

 (Seymour.) 



86. Cekcospora grisea, C. & E. Grev. Y, p. 49. N. A. F. 49. 

 Ilyphse short, simple, fuscous, fasciculate, covering the leaves and 



stem with minute, punctiform tufts scarcely distinguishable by the naked 

 eye but imparting a grayish color to the affected parts. Conidia linear, 

 multiseptate, 100—125 p- long. 



On living leaves, stems and flowers of Polygala lutea and P. cruciata. 

 Newfield, i^. J. 



87. Cercospora consociata. Winter. Hedwigia, May, 1883, p. 70. 

 Tufts hypophyllous, densely gregarious, forming large, dark colored 



patches generally limite 1 by the veiulets of the leaf which shows corres- 

 ponding dark or greenish spots above. Hyphse fasciculate, short, 35 — 50 

 X 5 /-t, nodulose, dark, septate. Conidia very narrow-subclavate-filiform. 

 slightly thickened below, remotely multiseptate. with a pale fuscous 

 tint, reaching 125 long, and Si /->■ thick belov/. 



On living leaves of Dipteracanthus ciliosus, Illinois (Seymour.) 



88. Cercospora sordida, Sacc. Mich. II, p. 149. 

 Hypophyllous, elfused, forming dull olivaceous patches. Hypha^ 



loosely fasciculate, short, reddish-browm (under the microscope. ) Conidia 

 narrow-obclavate, 80—110 x 4 /^-, apices acute, 4—6 septate, olivaceous. 



On living leaves of Tecoma mdicans, Ga. (Ravenel.) Foundal so at 

 ^^ewfield, N. J. 



89. Cercospora effusa (B. & C.) Cladosjiorium effusum. B. & C. 

 Grev. Ill, p. 106. 



Hyphse hypophyllous, fasciculate, subnodulose, 35—45 x 3 f^-. Tufts 

 much effused, forming indefinite, rusty brown patches on the lower side 

 of the leaf which is marked above with pale yellowish, indefinite spots 

 Conidia subhyaline, cylindric-clavate, with one or more septa, 45 — 60 x 3 — 



On living leaves of Lobelia syphilitica, Iowa (Holway.), and L. cardin- 

 alis, Kansas (Kellerman.) 



90. Cercospora murina, E. & K. Bull. Torr. Bot. Club, XI, p. 122. 

 Hypophyllous, on large (.5—1 cm.), roundish, indefinitely limited, 



dirty brown spots (dirty white above). Hyphse effused, mouse-colored, 

 branched, septate, clear fuscous brown, 75—100 x 3—4 fJ-. Conidia oblong 

 or oblong-cylindric, 3-septate, brownish, sometimes slightly constricted 

 at the septa, 25—35 x 4—5 Looks like a fine, mouse-colored dow^i 

 overrunning spots previously occupied (?) by another Cercospora iC. gran- 

 uliformis, Ell. & Hoi.) 



On leaves of Viola c^^cw^^a^a, Kansas (Kellerman.) 



91. Cercospora fusco-virens, Sacc. Mich. II, p. 149. 



